© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
NANO2® > Very Fast Acting Fuse > 456 Series
456 Series Fuse
Description
The High Current NANO2® Fuse is a small square surface
mount fuse that is designed to support higher current
requirements of various applications.
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RATING
E10480 20A - 40A
T50291892 20A - 30A
PS
ENBK030308-JP1021 20A - 30A
29862 20A - 40A
Electrical Characteristics
Features
RoHS
% of
Ampere Rating Opening Time
100% 4 hours, Minimum
200% 60 seconds, Maximum
Electrical Specifications
Ampere
Rating
(A)
Amp
Code
Max
Voltage
Rating
(V)
Interrupting
Rating
Nominal
Cold
Resistance
(Ohms)
Nominal
Melting
I2t (A2 Sec.)
Nom Voltage
Drop
(mV)
Agency Approvals
PS
E
20 020. 125
100A @125VAC
300A @ 65VAC
300A @ 100VDC
1000A @ 32VDC
500A @ 72VDC
0.00230 18 64.7 x x x x
25 025. 125
100A @ 125VAC
300A @ 65VAC
500A @ 72VDC
1000A @ 32VDC
0.00192 45 68.38 x x x x
30 030. 125
100A @ 125VAC
300A @ 65VAC
1000A @ 32VDC
500A @ 72VDC
0.00132 81 69.9 x x x x
40 040. 72 180A @ 72VDC
600A @ 60VDC 0.00105 191 55 x x
Applications
• Voltage regulator module
for PC server
• Cooling fan system for
PC server
• Storage system power
• Basestation power
supply
• Surface mount high
current fuse
• Fully compatible with
lead-free solder alloys
and higher temperature
profiles associated with
lead-free assembly
• RoHS compliant and
Halogen Free
• Available in ratings of 20
to 40 Amperes
PS
E
Notes:
1. Cold resistance measured at less than 10% of rated current at 23°C.
2. Agency Approval Table Key: X=Approved or Certified, P=Pending.
3. I2t values stated for 1 msec opening time.
40A
20A, 25A, 30A
Application testing is strongly recommended.
Additional Information
Datasheet Samples
Resources
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
NANO2® > Very Fast Acting Fuse > 456 Series
Average Time Current CurvesTemperature Re-rating Curve
PERCENT OF UPRATING
PERCENT OF DOWNUPRA
TING
AMBIENT TEMPERATURE
248°F212°F176°F140°F104°F68°F32°F-4°F-40°F-76°F
120°C
264°F
140°C100°C80°C60°C40°C20°C0°C-20°C-40°C-60°C
0 0
20
40
60
20
40
60
Soldering Parameters – Reflow Soldering
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (Ts(min)) 150°C
- Temperature Max (Ts(max)) 200°C
- Time (Min to Max) (ts) 60 – 180 secs
Average ramp up rate (Liquidus Temp
(TL) to peak 5°C/second max.
TS(max) to TL - Ramp-up Rate 5°C/second max.
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL) 60 – 150 seconds
Peak Temperature (TP)260+0/–5 °C
Time within 5°C of actual peak
Temperature (tp)20 – 40 seconds
Ramp-down Rate 5°C/second max.
Time 25°C to peak Temperature (TP) 8 minutes max.
Do not exceed 260°C
Time
Temperature
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
(t 25ºC to peak)
Ramp-down
Ramp-up
Preheat
Critical Zone
TL to TP
0.01
0.1
1
10
100
1 10 100 1000
TIME IN SECONDS
CURRENT IN AMPS
40A
30A
20A
25A
1000
Note:
1. Rerating depicted in this curve is in addition to the standard derating of 25% for
continuous operation.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 12/14/17
Surface Mount Fuses
NANO2® > Very Fast Acting Fuse > 456 Series
Operating Temperature -55OC to 125OC with proper derating
Thermal Shock
MIL-STD-202, Method 107,
Test Condition B
(5 cycles -65OC to 125OC)
Vibration MIL-STD-202, Method 201
(10-55 Hz)
Moisture Sensitivity
Level J-STD-020, Level 1
Moisture Resistance
MIL-STD-202 Method 106,
High Humidity (90-98%RH),
Heat (65OC)
Salt Spray MIL-STD-202, Method 101,
Test Condition B
Mechanical Shock
MIL-STD-202, Method 213,
Test Condition I (100 G’s peak for 6
milliseconds)
Product Characteristics
Dimensions Part Numbering System
Packaging
Rating Packaging
Option
Packaging
Specification Quantity
Quantity &
Packaging
Code
20A,
25A, 30A
24 mm Tape
and Reel EIA RS-481-2 2500 ER
40A 24 mm Tape
and Reel
EIA RS-481-
2 (IEC 286,
part 3)
1500 DR
Materials Body: Ceramic
Cap: Silver Plated Brass
Product Marking Body: Brand Logo, Current Rating
Insulation Resistance MIL-STD-202, method 302, Test
Condition A (10,000 ohms, Minimum)
Solderability MIL-STD-202, Method 208
Resistance to
Soldering Heat
MIL-STD-202, Method 210,
Test Condition B (10 sec at 260OC)
PCB
Recommendation for
Thermal Management
Min. copper layer thickness = 100µm
Min. copper trace width =20A, 30
10mm (20A, 30A) / 15mm (40A)
Alternate methods of thermal man-
agement may be used. In such cases,
under normal operations, the maxi-
mum temperature of the fuse body
should not exceed 90OC in a 25OC
environment.
10.08
(.397”)
3.05
(.12”)
12.50
(.492)
4.445
(.175”)
4.445
(.175”)
Recommended Pad Layout
Recommended Pad Layout
2.173
(.086”)
2.79
(.110”)
0.30
(.012”) 3.79
(.149”)
5.72
(.225”)
13.3
(.524”)
5.65
(.222”)
3.05
[.12”]
1.70 typ
(0.067”)
3.25
(.128”)
3.43
(.135”)
12.60
(.496”)
6.10
(.240”)
20 A
20A, 25A, 30A:
40A:
F
40 A
F
0456 020. E R
SERIES
AMP Code
QUANTITY Code
PACKAGING Code
Refer to Electrical
characteristics table
E = 2500 pcs
D = 1500 pcs
R = Tape and Reel
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aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other
application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those
expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any
purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products
used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is
subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Information furnished is believed to be accurate and reliable.
However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not
designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
